Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2020

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment at March 31, 2020 and December 31, 2019 consisted of the following:

	Residual Value as Percentage of Original Cost	Estimated Useful Life in Years	March 31, 2020			December 31, 2019
			(In thousands)
Land			$	1,626		$	1,653
Vehicles and machinery	0 - 55%	5 - 30		176,148			174,191
Buildings and improvements (1)	0 - 25	3 - 30		32,721			33,137
Computer equipment and software	0	3 - 10		78,675			76,587
Furniture and office equipment	0	3 - 10		4,975			5,354
Property, plant and equipment				294,145			290,922
Accumulated depreciation				(140,321	)		(133,739	)
Property, plant and equipment, net			$	153,824		$	157,183

(1) Improvements made to leased properties are depreciated over the lesser of the estimated remaining life or the remaining term of the respective lease.